Logitech Craft Keyboard Compatible Battery 3.8V 1200mAh

Logitech Craft / Y-R0064 — 3.8V Li-Polymer Replacement Battery (533-000142)

This 3.8V 1200mAh Li-Polymer battery replaces the OEM 533-000142 cell inside the Logitech Craft advanced wireless keyboard. It fits the Craft and Y-R0064 variants — the keyboard known for its Crown input dial and Bluetooth multi-device switching. Swap this in when the original cell no longer holds a charge or the keyboard stops powering on.

• Craft and Y-R0064 compatibility: Both model references point to the same Craft keyboard hardware revision. They share the same battery bay geometry, connector pinout, and BMS communication protocol — one cell fits both without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Craft unit. The BMS accepted the cell without fault flags, and the keyboard's battery indicator reported charge level accurately across the full range.
• Reconnection after battery swap: The Craft keyboard can drop its Bluetooth pairing when power is fully interrupted during a battery swap. After fitting the new cell, hold the Easy-Switch button for three seconds to force the keyboard back into pairing mode before assuming the battery is faulty.

Why the Craft keyboard loses its active device slot after a flat battery

The Craft stores its active Bluetooth channel and macro layer state in volatile memory backed by the main cell. When the battery drains completely — below roughly 3.0V — that memory clears. On power-up with a fresh cell, the keyboard reverts to channel 1 and drops any custom Easy-Switch assignment you had active. Re-select your channel using the Easy-Switch button and re-pair via Logitech Options or Options+ if the host device no longer appears in the list.

Craft keyboard showing full charge but cutting out during the Crown dial spin

The Crown dial triggers a brief current spike each time it registers a step — more so when controlling high-resolution scroll targets in Adobe or Figma. A degraded cell with elevated internal resistance can sag enough under that spike to trigger an undervoltage cutoff, even when the indicator reads partial charge. The symptom is the keyboard freezing mid-gesture and recovering after a second. Charge the replacement cell fully to 4.35V before first use — this confirms the cell reached its rated capacity and rules out a shipping partial-charge fault.